Steam-engine



(No Model.)

B. P. SPARR. STEAM ENGINE. No. 520,456. Patent'd May 29, 1894.

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UNITED STATES PATENT OFFICE.

BENJAMIN FRANKLYN SPARE, OF BROOKLYN, NEW YORK.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 520,456, dated May 29, 1894. Application filed December 4, 1893. Serial No. 492,6'70- (No model.)

To all whom it may concern: Be it known that I, BENJAMIN FRANKLY SPARE, of Brooklyn, New York, have invented an Improved Steam-Engine, of which the following is a specification.

This invention relates to a steam engine before it is finally exhausted, is applied successively to opposite sides of the piston head, so that its full power may be utilized. The piston head is constructed in a peculiar manner, being provided at its center with a collar or flange, against which the steam is made to act, after it has previously acted upon the opposite end of the piston itself. Thus the action of the piston is precisely the same at both strokes and a nniformmovement results.

In the accompanying drawings: Figure 1 is a longitudinal section of a steam cylinder provided with my improvement. Fig. 2 is a similar section, showing the parts ina different position. Fig. 3 is a cross section on line so, as, Fig. l, with the piston omitted, and Fig. 4 a cross section on line 11,1 Fig. 2, with the piston, valve chest and valve omitted.

The letter (1, represents a steam cylinder provided with an enlarged central chamber a, and with contracted ends at both sides of said chamber. The piston head b, is provided at its center with a fixed collar 1), adapted to reciprocate within chamber a, while the two ends of the piston are of a size to engage the two contracted ends of the cylinder. The cylinder a, is provided with four ports, 1, 2, 3, 4, of which the ports 1 and 4 enter the extreme ends of the cylinder itself, while the ports 2, and 3, enter opposite ends of-the chamber a- The valve 0, is provided with the steam duct 5, adapted to register with the ports 1, 2, 3 and 4, and with a duct 6, adapted to register with the exhaust 7.

The operation of the engine will be readily understood. Steam enters the valve chamber 01, through pipe 8, and passes into port 1 (Fig. 1), to move the piston toward the right. The valve 0, will move past port 1, to open of collar 1), goes to the exhaust by passages 3, 6 and 7. When the piston has reached its extreme position, the operation of the parts is reversed. That is to say, the live steam enters port 4, from the valve chamber and the steam from the left hand end of the piston, passes through port 1, duct 5, and port 3, to the right hand side of collar 1). The steam from the left hand side of such collar is exhausted through passages 2, 6 and 7. It will be seen, that with my engine, the steam is fully utilized before it is exhausted and that the operation of the pistonis precisely the same at both strokes.

The advantages connected with my engine are its simplicity, efficiency and economy in power and space.

. What I claim is The combination of a steam cylinder, having an enlarged section between contracted ends, cylinder heads secured upon said ends, a cylindricalpiston,havingclosed ends, working in such contracted portion from end to end of the steam cylinder, and having an outwardly extending collarintermediately secured thereon working in the enlarged section, a valve chamber secured upon the steam cylinder, ports leading therefrom to the ends of the cylinder and the ends of the enlarged section and an exhaustpassage, and a valve in said valve chamber which simultaneouslyconnects the valve chamber or steam chest with the contractedportion of the cylinder at one end, and the enlarged section at that end with the contracted'portion at the other end and the enlargedsection at the other end with the exhaust passage, substantially as described.

BENJAMIN FRANKLYN SPARE.

Witnesses: F. v. BRIESEN,

W SCHULZ. 

